Improvement in pumps



UNITED STATI-:sv

PATENT OFFICE.'

IMPROVEMENT IN PUMPS.

Specification forming part of Letters Patent No. 36,837, dated November4, 1862.

.To aZZ whom it may concern: p

Beit known that we, H. C. HUNT and Gr.

g W. DEvIN, of Ottumwa, in the county of Wapello and State of Iowa, haveinvented a new and Improved Force-Pump; and we do hereby declare thatthe following is a full,

sponding parts in the several figures.

The object of this invention is to obtain a force-pump which will besimple in construction, capable of being operated with but a smallexpenditure of power, and of being manufactured at a reasonable cost,and not liable to get out of repair nor become deranged by use.

To this lend the invention consists in the employment or use of astationary semi-cylindrical shell, provided with a partition or anabutment, with induction openings and an eduction-tube, and alsoprovided with a slidevalve and oscillating pistons, all arranged tooperate as hereinafter fully set forth.

To enable those skilledin the art to fully understand and construct ourinvention, we will proceed to describe it.

A represents a well or reservoir from which the water is to be drawn orpumped, and B is a semi-cylindrical cast-metal case, which is secured inany proper wayin the lower part of the well. i The case B may be cast inone piece, and it is provided with a vertical partition or abutment, a,which divides it into two equal compartments, b b', as shown clearly inFig. 1. Each compartment b b of the case B has an inductionopening, c,and between these induction-openings an eduction-pipe, C, communicateswith the interior of the mcase, the partition abeing in line with thecenter of the pipe C, as shown in Fig. 1.

D is a slide-valve, which is of curved form, corresponding to thecurvature of the case B and equal to it in width. This valve is providedwith a central opening, d. The valve D is placed between the upper endof the partition c and the inner side of the case B, and is allowed towork freely to the right and left, so that its opening d may be shiftedrst into one compartment, b, of the case B, and then into the other one,b', and form a communication alternately between said compartments andthe eduction-pipe C.

E E represent two pistons', which work in the compartments b b of thecase'B. These pistons are equal in width to the interior of the case B,and they form radii of a semicircular plate, F, which works against acylindrical projection, e, at the lower end of the partition a, saidprojection fitting in a recess, f, between the inner parts of thepistons E E. The plate F is not solid, but is provided with projectingarms g g, which form the principal part of the exterior of the plate F,and are at the outer side of the case B, as shown in Fig. 1. The ends ofthe pistons E E are rounded to correspond to the curvature of the innerside` of the case B. The pistons E E and plate F are all cast in onepiece. y

To each arm g of the plate F there is attached a chain, h, which forms aconnection between the arms g and a lever, G, at the upper part of thewell A. The chains li may extend up to the lever G, or they may beconneeted to rods i, the latter being connected to the ends of thelever, as shown in Fig. 1. The lever G is of T form, and by moving itback and forth it will be seen that an oscillating movement will becommunicated to the plate F and pistons E E. Different forms of levers,however, may be used for operating the pistons, and we do not confineourselves to any particular kind or arrangement of the same foreffecting the purpose.

rlhe eduction-pipe C, near its upper end, is provided with anair-chamber, H.

The operation is as follows: As the pistons` E E work or oscillate intheir respective compartments b b in the case B, the water is forcedalternately from each compartment into the eduction-pipe C through theopening ci in the slide-valve D, and just previous to the termination ofeach upward movement of the pistons the slide D is shoved along inconsequence of the piston coming in contact with it, and the opening dmade to pass into the compartment of the piston which is at thetermination of its downward movement, and the induction-opening c ofsaid compartment is closed by the valve, while the inductionopeningofthe other compartment containing the elevated piston is not closed bythe valve, and hence forms a communication between said compartment andthe well. It will be seen, therefore, that as the lowest piston ascends,the water in its compartment will be forced up through the opening d inthe valve D into the pipe G, while the compartment containing thedescending piston will be filled with water passing through itsinductioni opening c, which opening is closed by the valve D at thetermination of thel movement of the rising piston, and the opening d atthe same time made t'o form a communication between the compartment ofthe lowest pistou and pipe C. Thus a continuous stream is forced throughthe pipe G, and it will be seen that the leverage-power is the samethrough- -out the whole operation, as the chains l1, always Work fromthe periphery of the arms g. The pump may be constructed at a smallcost, and

there areno parts liable to get out of repair or become deranged by use,as there is but one valve and no packing, and all the force applied actsdirectly on the water to be raised.

Having thus described our invention, what we claim as new, and desire tosecure by Letters Patent, is-

The stationary semi-cylindrical case B, pro-

